/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { lineBreakG } from './whitespace';

function getLineInfo(input: string, offset: number): Position {
  for (let line = 1, cur = 0; ; ) {
    lineBreakG.lastIndex = cur;
    const match = lineBreakG.exec(input);
    if (match && match.index < offset) {
      ++line;
      cur = match.index + match[0].length;
    } else {
      return new Position(line, offset - cur);
    }
  }
}

class Position {
  line: number;

  column: number;

  constructor(line: number, col: number) {
    this.line = line;
    this.column = col;
  }
}

class SourceLocation {
  start: Position;

  end: Position | null = null;

  filename: string = '';

  identifierName: string | null = null;

  constructor(start: Position, end: Position | null) {
    this.start = start;
    this.end = end;
  }
}

export { SourceLocation, Position, getLineInfo };
